Scale-invariant, resolution-invariant iris imaging using reflection from the eye
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United States of America Patent
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Aug 14, 2012
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Jun 29, 2009
filing date -
Jun 28, 2008
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Abstract
An optical system includes an active focus element that maintains an image in focus over a range of object distances. The active focus element and aperture stop are positioned such that the image scale and the image spatial resolution are also invariant (or at least have a reduced sensitivity) with respect to object distance.
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